Orbit Fit and Astrometric record for 12DX98

The following information shows the result of the orbit fit based on Gary Bernstein's method. Most of the information should be self-explanatory. Take special note that while the original Bernstein software works with barycentric coordinates, we convert these results into a heliocentric coordinate system.

# Object: 12DX98    
# Created Tue Apr 23 01:09:46 2019
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   78 observations of   78
# Arc:  16.09y
# First observation: 2002/03/12
#  Last observation: 2018/04/12
# Chi-squared of fit:    75.54 DOF:  150 RMS:  0.17
# Min/Max residuals:    -0.56    0.90
# Exact a, adot, b, bdot, g, gdot:
  1.677170E-05  3.227351E-02 -3.432582E-06 -6.987942E-03  2.845334E-02 -3.646498E-03
# Covariance matrix:
  5.3410E-13 -8.5654E-14 -5.4387E-14  1.3919E-14 -5.0057E-14 -9.2247E-14
 -8.5654E-14  1.8133E-14  1.3836E-14 -3.5493E-15  1.0510E-14  2.3549E-14
 -5.4387E-14  1.3836E-14  2.8944E-13 -2.3825E-14  8.6163E-15  1.9782E-14
  1.3919E-14 -3.5493E-15 -2.3825E-14  2.4201E-15 -2.0036E-15 -5.0836E-15
 -5.0057E-14  1.0510E-14  8.6163E-15 -2.0036E-15  6.2325E-14  1.2632E-14
 -9.2247E-14  2.3549E-14  1.9782E-14 -5.0836E-15  1.2632E-14  3.3756E-14
#      lat0       lon0       xBary       yBary       zBary        JD0
    4.880075  168.746461   -0.052860    0.084344   -0.988857  2452345.762252
# Heliocentric elements and errors
Epoch:              2452346.5000  =  2002/03/13
Mean Anomaly:          343.58371 +/-     0.002
Argument of Peri:      187.68900 +/-     0.003
Long of Asc Node:        9.70885 +/-     0.000
Inclination:            13.10915 +/-     0.000
Eccentricity:         0.26938163 +/-    0.0000
Semi-Major Axis:     48.13385387 +/-    0.0024
Time of Perihelion: 2457908.7023 +/-       8.7
Perihelion:          35.16747787 +/-    0.0022
Aphelion:            61.10022986 +/-    0.0033
Period (y)              333.9521 +/-      0.02
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -35.32743806 +/-    0.0003
Ecliptic Y            6.98056718 +/-    0.0001
Ecliptic Z            2.98971932 +/-    0.0000
Ecliptic XDOT        -0.00032768 +/-    0.0000
Ecliptic YDOT        -0.00310386 +/-    0.0000
Ecliptic ZDOT        -0.00069959 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.13446481 +/-    0.0003
Geocenter to KBO     35.14536475 +/-    0.0003
# Hcoef:  7.27

The following table shows the complete astrometric record for 12DX98. The first three columns show the date of observation. The next six columns are RA and DEC. The next column (when provided) is the observed magnitude and filter. The next column is the object name (12DX98) followed by the observatory code and reference code for the source of the astrometry.

2002 03  12.261509 11 26 20.47   +08 56 23.1   22.4V 12DX98    645  C~2VVI      
2002 03  12.262339 11 26 20.45   +08 56 23.3   21.6V 12DX98    645  C~2VVI      
2006 01  07.515007 11 55 14.55   +04 02 30.0   22.4V 12DX98    645  C~2VVI      
2006 01  07.515837 11 55 14.55   +04 02 29.9   22.2V 12DX98    645  C~2VVI      
2006 01  07.518324 11 55 14.56   +04 02 30.0   24.0V 12DX98    645  C~2VVI      
2010 06  30.30102  12 11 12.226  +00 11 52.87  22.5G 12DX98    F51  C~2rXs      
2010 07  01.29948  12 11 13.814  +00 11 35.41  23.0G 12DX98    F51  C~2rXs      
2011 03  14.58942  12 22 53.701  -01 21 53.84  22.3G 12DX98    F51  C~2rXs      
2012 02  27.47944  12 30 30.890  -02 39 16.56  22.6w 12DX98    F51  C~1vWc      
2012 02  27.49423  12 30 30.829  -02 39 16.51  22.9w 12DX98    F51  C~1vWc      
2012 02  27.52376  12 30 30.696  -02 39 15.80  22.9w 12DX98    F51  C~1vWc      
2012 04  12.34319  12 26 42.668  -02 18 17.36  22.5w 12DX98    F51  C~1vWc      
2012 04  12.35713  12 26 42.598  -02 18 17.01  22.2w 12DX98    F51  C~1vWc      
2012 04  12.37113  12 26 42.527  -02 18 16.62  22.4w 12DX98    F51  C~1vWc      
2012 04  12.38510  12 26 42.458  -02 18 16.24  22.3w 12DX98    F51  C~1vWc      
2013 01  10.64252  12 38 46.989  -03 58 03.21  22.0G 12DX98    F51  C~2rXs      
2013 03  19.48899  12 35 14.748  -03 40 38.70  22.4w 12DX98    F51  C~1vWc      
2013 03  19.50435  12 35 14.663  -03 40 38.52  22.5w 12DX98    F51  C~1vWc      
2013 03  19.51978  12 35 14.588  -03 40 37.96  22.4w 12DX98    F51  C~1vWc      
2013 03  19.53522  12 35 14.494  -03 40 37.53  22.4w 12DX98    F51  C~1vWc      
2014 02  26.55439  12 43 23.455  -05 00 16.11  23.6G 12DX98    F51  C~2rXs      
2014 03  06.46193  12 42 48.261  -04 57 13.69  22.6G 12DX98    F51  C~2rXs      
2014 05  25.36864  12 36 38.283  -04 24 11.48  22.7G 12DX98    F51  C~2rXs      
2014 06  16.30520  12 36 02.121  -04 21 49.12  23.4G 12DX98    F51  C~2rXs      
2015 01  23.54591  12 51 23.407  -06 16 41.21  22.8G 12DX98    F51  C~2rXs      
2015 01  25.53823  12 51 21.204  -06 16 39.75  22.8w 12DX98    F51  C~1vWc      
2015 01  25.55354  12 51 21.186  -06 16 39.45  22.8w 12DX98    F51  C~1vWc      
2015 01  25.58416  12 51 21.150  -06 16 39.41  22.8w 12DX98    F51  C~1vWc      
2015 02  15.51937  12 50 33.814  -06 13 48.15  21.7G 12DX98    F51  C~2rXs      
2015 02  15.54527  12 50 33.695  -06 13 47.57  22.9G 12DX98    F51  C~2rXs      
2015 02  15.55816  12 50 33.669  -06 13 47.44  22.6G 12DX98    F51  C~2rXs      
2015 02  16.50441  12 50 30.571  -06 13 33.57  22.8G 12DX98    F51  C~2rXs      
2015 02  16.51712  12 50 30.525  -06 13 33.36  22.9G 12DX98    F51  C~2rXs      
2015 02  16.52979  12 50 30.481  -06 13 33.03  22.8G 12DX98    F51  C~2rXs      
2015 02  16.54248  12 50 30.465  -06 13 33.06  23.5G 12DX98    F51  C~2rXs      
2015 02  27.54433  12 49 49.107  -06 10 17.12  22.5G 12DX98    F51  C~2rXs      
2015 02  27.55688  12 49 49.035  -06 10 17.18  22.4G 12DX98    F51  C~2rXs      
2015 02  27.56942  12 49 48.988  -06 10 16.85  22.8G 12DX98    F51  C~2rXs      
2015 02  27.58195  12 49 48.944  -06 10 16.72  22.6G 12DX98    F51  C~2rXs      
2015 04  13.38794  12 46 03.697  -05 50 29.69  22.4G 12DX98    F51  C~2rXs      
2015 04  13.39877  12 46 03.652  -05 50 29.28  22.7G 12DX98    F51  C~2rXs      
2015 04  13.40960  12 46 03.585  -05 50 29.29  23.3G 12DX98    F51  C~2rXs      
2015 04  13.42056  12 46 03.526  -05 50 28.79  22.9G 12DX98    F51  C~2rXs      
2015 04  15.42675  12 45 53.062  -05 49 31.98  22.5G 12DX98    F51  C~2rXs      
2015 05  24.30046  12 43 07.310  -05 34 39.11  22.7G 12DX98    F51  C~2rXs      
2016 01  15.63954  12 57 52.221  -07 25 03.37  22.5G 12DX98    F51  C~2rXs      
2016 01  16.65128  12 57 52.241  -07 25 10.24  23.1G 12DX98    F51  C~2rXs      
2016 02  03.60828  12 57 34.224  -07 25 21.98  23.4G 12DX98    F51  C~2rXs      
2016 02  09.65395  12 57 20.648  -07 24 38.57  22.4G 12DX98    F51  C~2rXs      
2016 02  10.53167  12 57 18.390  -07 24 30.17  22.8G 12DX98    F51  C~2rXs      
2016 03  13.45151  12 55 14.295  -07 14 58.96  22.5G 12DX98    F51  C~2rXs      
2016 03  13.45215  12 55 14.293  -07 14 59.34  22.3G 12DX98    F51  C~2rXs      
2016 03  13.46719  12 55 14.244  -07 14 58.62  21.4G 12DX98    F51  C~2rXs      
2016 03  13.48227  12 55 14.146  -07 14 58.24  23.0G 12DX98    F51  C~2rXs      
2016 03  31.42087  12 53 41.427  -07 06 57.36  22.9G 12DX98    F51  C~2rXs      
2016 04  01.41076  12 53 36.136  -07 06 29.20  22.6G 12DX98    F51  C~2rXs      
2016 04  01.42416  12 53 36.068  -07 06 29.07  23.0G 12DX98    F51  C~2rXs      
2016 04  01.43759  12 53 35.969  -07 06 28.67  21.3G 12DX98    F51  C~2rXs      
2016 04  01.45108  12 53 35.910  -07 06 28.15  22.8G 12DX98    F51  C~2rXs      
2016 04  02.39979  12 53 30.833  -07 06 01.09  22.3G 12DX98    F51  C~2rXs      
2016 04  02.41146  12 53 30.771  -07 06 00.84  22.6G 12DX98    F51  C~2rXs      
2016 04  10.35602  12 52 48.277  -07 02 13.36  22.3G 12DX98    F51  C~2rXs      
2016 04  10.36895  12 52 48.217  -07 02 12.73  22.4G 12DX98    F51  C~2rXs      
2016 04  10.38209  12 52 48.130  -07 02 13.04  22.3G 12DX98    F51  C~2rXs      
2017 02  22.49724  13 03 10.807  -08 31 18.55  22.8G 12DX98    F51  C~2rXs      
2017 03  17.44492  13 01 30.680  -08 23 33.28  22.6G 12DX98    F51  C~2rXs      
2017 03  27.45980  13 00 39.103  -08 19 12.95  22.8G 12DX98    F51  C~2rXs      
2017 03  27.47224  13 00 39.034  -08 19 12.46  22.3G 12DX98    F51  C~2rXs      
2017 03  27.48467  13 00 38.979  -08 19 12.17  23.3G 12DX98    F51  C~2rXs      
2017 03  27.49706  13 00 38.906  -08 19 11.91  22.5G 12DX98    F51  C~2rXs      
2017 04  20.36176  12 58 31.882  -08 08 00.49  23.9G 12DX98    F51  C~2rXs      
2017 12  25.65873  13 10 14.301  -09 35 07.07  23.6G 12DX98    F51  C~2rXs      
2018 01  03.65743  13 10 34.427  -09 38 23.26  23.9G 12DX98    F51  C~2rXs      
2018 03  17.50931  13 08 08.834  -09 33 20.84  22.3G 12DX98    F51  C~2rXs      
2018 04  12.42253  13 05 52.458  -09 21 53.07  22.4G 12DX98    F51  C~2rXs      
2018 04  12.43542  13 05 52.375  -09 21 52.85  20.3G 12DX98    F51  C~2rXs      
2018 04  12.44830  13 05 52.318  -09 21 52.33  23.1G 12DX98    F51  C~2rXs      
2018 04  12.46119  13 05 52.264  -09 21 52.05  22.5G 12DX98    F51  C~2rXs      

The following table shows the residuals to the orbit fit. The first coumn is the point number. The second column is the time, in years, measured from the first observation. The third and fifth columns are the regularized positions used in the orbit fit. The fourth and sixth columns are the residuals, in arc seconds, for RA and Dec respectively.

  1   0.0000      0.00     0.19       0.00    -0.18
  2   0.0000      0.00    -0.05       0.00    -0.00
  3   3.8255      0.00    -0.17       0.00     0.09
  4   3.8255      0.00    -0.16       0.00    -0.01
  5   3.8255      0.00     0.03       0.00     0.07
  6   8.3013      0.00     0.07       0.00    -0.08
  7   8.3040      0.00    -0.03       0.00    -0.14
  8   9.0057      0.00    -0.33       0.00     0.19
  9   9.9636      0.00    -0.17       0.00     0.34
 10   9.9637      0.00    -0.08       0.00     0.03
 11   9.9638      0.00    -0.06       0.00     0.03
 12  10.0865      0.00     0.10       0.00     0.23
 13  10.0865      0.00     0.13       0.00     0.20
 14  10.0865      0.00     0.16       0.00     0.20
 15  10.0866      0.00     0.21       0.00     0.20
 16  10.8347      0.00    -0.07       0.00     0.15
 17  11.0205      0.00     0.19       0.00     0.16
 18  11.0205      0.00     0.14       0.00    -0.10
 19  11.0206      0.00     0.24       0.00     0.02
 20  11.0206      0.00     0.06       0.00     0.01
 21  11.9625      0.00    -0.19       0.00    -0.14
 22  11.9841      0.00    -0.35       0.00    -0.14
 23  12.2029      0.00    -0.03       0.00     0.01
 24  12.2630      0.00    -0.08       0.00     0.26
 25  12.8687      0.00     0.03       0.00     0.08
 26  12.8741      0.00     0.09       0.00    -0.20
 27  12.8742      0.00     0.12       0.00     0.08
 28  12.8743      0.00     0.18       0.00     0.07
 29  12.9316      0.00     0.32       0.00    -0.22
 30  12.9316      0.00    -0.17       0.00    -0.01
 31  12.9317      0.00     0.09       0.00    -0.07
 32  12.9343      0.00     0.11       0.00    -0.11
 33  12.9343      0.00     0.07       0.00    -0.09
 34  12.9343      0.00     0.06       0.00     0.05
 35  12.9344      0.00     0.47       0.00    -0.17
 36  12.9645      0.00     0.01       0.00     0.02
 37  12.9645      0.00    -0.27       0.00    -0.30
 38  12.9646      0.00    -0.17       0.00    -0.23
 39  12.9646      0.00    -0.03       0.00    -0.35
 40  13.0873      0.00    -0.11       0.00     0.03
 41  13.0873      0.00     0.08       0.00     0.13
 42  13.0873      0.00    -0.05       0.00    -0.19
 43  13.0874      0.00    -0.06       0.00     0.00
 44  13.0929      0.00    -0.07       0.00    -0.10
 45  13.1993      0.00    -0.14       0.00    -0.06
 46  13.8463      0.00    -0.11       0.00    -0.10
 47  13.8491      0.00    -0.08       0.00     0.15
 48  13.8983      0.00     0.06       0.00    -0.05
 49  13.9148      0.00     0.15       0.00    -0.09
 50  13.9172      0.00     0.10       0.00     0.12
 51  14.0046      0.00    -0.10       0.00     0.17
 52  14.0046      0.00    -0.08       0.00    -0.23
 53  14.0047      0.00     0.31       0.00     0.12
 54  14.0047      0.00    -0.04       0.00     0.13
 55  14.0538      0.00    -0.10       0.00    -0.04
 56  14.0565      0.00    -0.05       0.00     0.04
 57  14.0566      0.00     0.03       0.00    -0.21
 58  14.0566      0.00    -0.36       0.00    -0.20
 59  14.0566      0.00    -0.14       0.00    -0.06
 60  14.0592      0.00    -0.16       0.00     0.00
 61  14.0593      0.00    -0.13       0.00    -0.08
 62  14.0810      0.00     0.04       0.00    -0.14
 63  14.0811      0.00     0.20       0.00     0.12
 64  14.0811      0.00    -0.04       0.00    -0.56
 65  14.9520      0.00     0.24       0.00     0.14
 66  15.0149      0.00    -0.06       0.00     0.03
 67  15.0423      0.00    -0.02       0.00    -0.13
 68  15.0423      0.00    -0.05       0.00     0.02
 69  15.0424      0.00     0.13       0.00    -0.03
 70  15.0424      0.00     0.03       0.00    -0.11
 71  15.1077      0.00    -0.19       0.00    -0.16
 72  15.7903      0.00    -0.31       0.00     0.05
 73  15.8149      0.00     0.26       0.00     0.90
 74  16.0144      0.00    -0.05       0.00     0.23
 75  16.0853      0.00    -0.06       0.00     0.15
 76  16.0853      0.00    -0.25       0.00     0.01
 77  16.0854      0.00    -0.04       0.00     0.16
 78  16.0854      0.00     0.21       0.00     0.08

The following table comes from a 10My integration of the orbit of the object. Three columns are shown. The first column is the result of integrating the nominal orbit. The other two columns are based on clones of the nominal orbit that are +/- 3 sigma from the nominal orbit. If all three types agree then the classificiation is deemed secure. The basis for these calculations is described in more detail in AJ, 129, 1117 (2005). Any use made of these calculations should refer to and credit this publication and the Deep Ecliptic Survey Team.

12DX98    quality flag:3

Type:           2:1E      2:1E      2:1E

axisobj        47.707    47.707    47.707
ecceobj         0.264     0.264     0.264
incobj         13.141    13.141    13.141
qmin           34.516    34.491    34.547
qmax           62.176    62.098    62.022
amean          47.797    47.797    47.797
amin           47.124    47.105    47.119
amax           48.612    48.602    48.594
emean           0.258     0.258     0.258
emin            0.236     0.235     0.236
emax            0.280     0.279     0.278
imean          13.806    13.814    13.800
imin           13.153    13.212    13.169
imax           14.580    14.602    14.548
excite_mean     0.351     0.351     0.351
fracstop        1.000     1.000     1.000
cjmean          2.994     2.994     2.994

libcent 0       180.1     179.5     179.8
libamp  0       157.4     158.4     157.2
libcent 1      -180.0    -180.0    -180.0
libamp  1      -180.0    -180.0    -180.0
libcent 2      -180.0    -180.0    -180.0
libamp  2      -180.0    -180.0    -180.0
libcent 3      -180.0    -180.0    -180.0
libamp  3      -180.0    -180.0    -180.0
libcent 4      -180.0    -180.0    -180.0
libamp  4      -180.0    -180.0    -180.0

kozaimean       191.3     191.9     190.6
kozaiamp        180.0     180.0     180.0